A double-decker bus crashed in Ottawa, Canada, on Friday, killing three people and injuring at least 20, Mayor Jim Watson said at a news conference.The bus collided with the platform at the Westboro bus station at about 3:50 p.m., authorities said. Twenty-three people were hurt and taken to hospitals, and three people died -- two on the bus and one on the platform, Watson said.Ottawa Police Chief Charles Bordeleau said several people were trapped in the bus before being freed.Bordeleau said investigators are trying to determine the cause of the crash. The driver was questioned by police, he said.OC Transpo, which is in charge of Ottawa's public transportation, tweeted on its verified account, "Buses are being detoured as a result" of the collision.The Ottawa Police Service Collision Investigation Unit arrived to investigate the incident. Bordeleau said the Ottawa Paramedic Service and Ottawa Fire Services worked the scene in partnership with the Ottawa police.Authorities asked people to avoid the area. Video from CNN partner CTV News showed multiple emergency vehicles at Westboro Station.

(CNN) —

A double-decker bus crashed in Ottawa, Canada, on Friday, killing three people and injuring at least 20, Mayor Jim Watson said at a news conference.

The bus collided with the platform at the Westboro bus station at about 3:50 p.m., authorities said. Twenty-three people were hurt and taken to hospitals, and three people died -- two on the bus and one on the platform, Watson said.

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Ottawa Police Chief Charles Bordeleau said several people were trapped in the bus before being freed.

Bordeleau said investigators are trying to determine the cause of the crash. The driver was questioned by police, he said.

OC Transpo, which is in charge of Ottawa's public transportation, tweeted on its verified account, "Buses are being detoured as a result" of the collision.

The Ottawa Police Service Collision Investigation Unit arrived to investigate the incident. Bordeleau said the Ottawa Paramedic Service and Ottawa Fire Services worked the scene in partnership with the Ottawa police.